Grate.



T. R. COOK.

GRATE.

APPLIGATIONTILBD APR.1@, 1912.

1,108,887. Patented Sept. 1,1914.

2 SHEBTSMSHEET 1,

UUULILHIHUUUUl g T. R. COOK.

GRATE.

APPLICATION FILED APR.10,1912.

1,108,887. Patented sept. 1; 1914` 2 SHEETS'SHEBT 2.

[.\' VEN TOR.

THOMAS n. cook, or rIrrrsBuRGH, PENNSYLVANIA.

ern

incassa.

Specication of Letters Patent.

Application filed April 10, 1912. Serial No. 6892798;

PatentedSept. 1', 1914;..

To all @from it may concern:

Be 1t known that l, THOMAS R. COOK, a

citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, am the inventor of .certain new and useful Improvements in Grates, of which the following is a speciication.

The invention relates to grates, and in the particular embodiment of the invention illustrated, to grates for underfeed stoker furnaces, it being understood, however that the invention is of general application, and useful in relations other than the one illustrated. The invention has for its primary objects; the provision of an improved type of' grate wherein the shaking grates act as drop 'grates thus obviating the necessity of providing special drop grates; the provision of a structure of the character specified in which an adequate space is provided for dumping the contents of the furnace; the provision of a structure of the character specified wherein the opposing grate bars are connected so 'that they counterbalance v each other and may be easily moved in unison in the shaking operation. Certain embodiments of the invention are illustrated f in the accompanying drawings, whereinvet() ada ted for use upon underfeed stokers, and

is ilustrated as so applied in FigsT 1 and 2 wherein 1 is the water leg of alocomotive firebox, 2 and 3 are underfeed troughs tlrough which the fuel is fed'. by means off auxiliary plungers 4, 5, and 6, and by means ofmain plungers at the ends of the troughs" (n'ot'shown). ln the particular embodiment of the invention as illustrated 1n F1gs. 1 and 2, four grate bars 8, 9, 10,v and-.11 are 4employed, which grate bars extend from one end of'the firebox to the other and are supported for rotation at their ends as indicated iniFig. '1. intermediate the ends of the bars 8 and 11 are what maybe termed bearing plates- 12 and 13, which bearing plates serve tov give the bars' 8 and 11 the neeess supports intermediate" their ends.4

thereto.

Similarly intermediate' the ends of the barrf: 9 and 10 are `the bearing plates 14 and 15, such plates being supported upon the edges of the trough. Mounted' removably upon these barsl 8, 9, 10, an'dllI are the cast sections provided with' the grate fingers, the bars being square in cross section so that the sections are nonrotatable with respect rlh'ey upper side edges of the troughs 2 and 3 are preferably in the form ofthe cast' metal barsl 16, 17, 18, and 19,' which bars are provided with the downwardly and outwardly projecting link fingers20. Slmllarly the cast side bars 21 and:

22 are provided with upwardly and inwardly inclined grate ngers 23. The grate sections on the loars 8 and 11' coperating wlth the lingers 20l and 23 constitute the side grates and are operated to shake the grate by'means' of a suitable tool or wrench which engages the squaredouter ends 2410i? the bars; 'l

The grate sections'carried by the rotatable bars 9 and 1() are each provided withtwo lsets of fingers," the first setl comprising the relatively short upwardly and outwardly projecting fingers 25, and the other set comprising the inwardly and downwardly projecting fingers 26, which latter lfingers eX- tend laterally at theirv lower ends. The

outer ends of the b-Is 9 and 110 are provided:

with the rock arms 27 and 28, and these rock arms are releasably connected by means of the connecting ro'd 29, such rod having its left hand end forked as indicated in Fig- 3 and being secured at such end to the arm 27 by means of the removable bolt 30. It will'beseenl that both ofthe bars 9 and 10 are rocked when one of the rocker ,arms 27 or 28 is moved,-so that any desiredamount of shaking movement may be applied tothe fingers carried by the bars 9 and 10 by oscillating the rocker arms 27 and 28 veither directly or by means of a suitable tool or handle. The amount of this rocking movement is limited by the engagement of the edge of the rocker arm 27 with the end 31 of the fork. When it is desired to convert this rocking grate intoadrop grate, the connecting rod 29 is disengaged at its left-handv end as indicated in Fig. 3, thus permitting the grate fingers 26 to assume the position indicatedin dotted lines in Fig. 2. A comparatlvelyA large open space extending throughout vthe entirelength of the furnace is thus seeured The" connecting rod 29 ing of the'opposing grates on the bars 9 and 10., but also serves to secure the simultaneous rocking of the two sets of fingers by the,

operation of one of the rocker arms 27 or 28. As indicated most clearly in Fig. 3,' the fingersy 25 are made of very considerable depth and rounded or curved upon their outer faces, such arrangement belng desirable in that when the device is used as a drop grate the fingers 25 still intermesh with 'the fingers 20, and the crevice or opening which would otherwise occur between 4the two sets of n ers is avoided. As a result there is no di culty in moving the grate bars 9 and 10 to their yoperative position from the drop position, as'would be the case if a space were formed between the lingers 25 and 20 for the reception of clinkerand other material tendin Atof prevent the return movement of the ars.

In dropping the grate, one of the rock arms 27 or 28 is locked or held in position by any desired means whilethe other one is moved sli htly to permit the removal of the bolt 30 after which each bar is permitted to move to drop position. The reverse operation occurs when it is desired to bring 'the parts to operative position again as in dicated in Figs. 2 and 3.

invention is illustrated in Fig. 4 wherein a third rotatable bar 32 is provided intermediate the rotatable bars 33 and 34. `This bar32 carries the grate sections 35, and the dumping operation is secured by moving the bars 32, 33, and 34 so that their lingers occupy the vertical position as indicated in dotted lines in the ligure. This construction may well be utilizedin constructions wherein the distance rbetween the troughs is `so great that the construction of Fig. 1 is impracticable. It will beunderstood that various other modifications of the structure might be made without departing from the spirit. ofl the invention, the apparatus as t erein shown being merely illustrative of the invention whose scope is limited only` by the denition thereof as set forth in the claims. l 'r Having thus described my invention and illustrated its use, what -ll claim as new and desire. to secure by Letters Patent, isthe following:

1. ln combination `in a furna'ce havin opposing sets of fixed grate fingers inclined downwardlyA and extending longitudinally lof the furnace, and having means for sup-Y plying fuel upon the said sets of grate ingers, of a pair of rotatable rate bars lying etween and below the sait? sets of iingers and each having a set oflupwardly extending ngers coperatin with the said downwardly inclined xe another eet of ngere projecting downfingers and having,

incase? ward-ly to form a basket grate, and releasable means for limiting the rocking movement of the grate bars adapted when released to'permit the downwardly projecting fingers of the said bars toswing away from each other to provide a dumping space.

2. 'ln combination in la furnace having opposing sets of fixed grate fingers inclined downwardly and extending longitudinally 'of the furnace, and having means for supplying fuel upon the said sets of gra-te fingers, ofa pair of rotatable grate bars lying between and below the said sets of ngers and each having a set of upwardly extend? ing fingers coperating with the'said downwardly inclined fixed fingers and having another set of fingers projecting downwardly to form a basket grate, and releasable means for limiting the rocking movement of the grate bars and when released to permit Asets of fingers on the said bars to swing to substantially vertical position to provide a gers, of a pair of rotatable grate barslyingbetween and below the said'sets of iin- A slightly different embodiment of the gersV and each having la set of upwardly eX- tending fingers coperating with the saiddownwardly inclined fixed ngers and have4 opposing sets of fixed grate ngers incline downwardly and extending longitudinally ,of thefurnace, and having means for supplying fuel upon the said sets of grate 1in- -gers, of a pair of rotatable grate/ bars lying between and below the said sets of fingers and each having a set of upwardly extending ingers. coperating with :the said downwardly inclined fixed fingers and having another set of ngers projectin downwardly and then substantially.horlzontally to form a basket grate, and releasable securing means for the bars adapted when re.-A

leased toy permit the downwardly extending fin ers of the said bars to swing away from eac other to provide a dumping space be tween the bars, the horizontal portions of the said grate fingers on thetwo bars inter- 'meshing at thelongitudinal center .of thevv furnace.

dumping space be` eej eoy

ico

5.1n combination in a furnace havin opposing sets of xed grate ngers incline ldow/nwardly and extending longitudinally 'tee niemeer of the furnace7 and having means for supplying uel upon the said sets of grate fingers, of a pair of rotatable grate bars lying between and below the said Sets of fingers and eaehohaving a set of upwardly extending lingers cooperating with the said downwardly inclined fixed lingers and having another set of fingers projecting downwardly and then substantially horizontally to form a basket grate with the upwardly extending sets of lingers on the said bars of less length than the other sets of ngers carried thereby, and releasable means for the bars adapted when released to permit the downwardly extending ngers of the 15 said bars to swing away from each other to provide a dumping space between the bars. ln testimony whereof l have hereunto signed my name in the presence of the two subscribed witnesses.

THOMAS R. COOIQ Witnesses:

LETITIA MYERS, ARCHWORTH MARUN. 

